On the other hand we are frequently asked to certify ROHS compliance for tin
lead solder pastes. Hard to know how to answer, "Non specified ingredients
excepted we certify...."?
Sometimes the request is accompanied by a 10-15 page questionnaire listing
all known banned chemicals and requiring us to certify their % presence in
our products. But if they are banned....... I suppose the reasoning, if any,
is if we were silly enough to use them we would we be silly enough to admit
it.
Regards
Mike
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Martin Butcher
Sent: 13 December 2005 15:04
To: [log in to unmask]
Subject: Re: [TN] Qualification of the Pb-free capable manufacturers
Here's one for you...we recently recieved sn-pb solder paste with a ROHS
compiant sticker on it!
-----Original Message-----
From: Werner Engelmaier [mailto:[log in to unmask]]
Sent: Tuesday, December 13, 2005 7:00 AM
To: [log in to unmask]
Subject: Re: [TN] Qualification of the Pb-free capable manufacturers
Hi Charlie,
Yes, that would serve. We have "PTH/PTV Reliability Coupons," "Registration
Coupons" and "SIR Coupons"--why not "Delamination Coupons." At this point,
it is however not clear, at least to me, which PWB design features [lots of
Cu, little Cu, coupon size, etc.] are the most critical in terms of
lamination.
But my question is as 'Why should the burden not be on the suppliers?'--they
control the properties of their materials and it should be part of their
data sheets. Unfortunately, data sheets are made of very uncomplaining
paper--I have found data sheets from large 'reputable' suppliers giving CTE
values of
FR-4
material as low as 11 ppm/C when the true CTE when we measured it was almost
double.
Why is it, that in our industry, most of the suppliers are part of the
problem rher than part of the solution?
With this 'Lead-Free' insanity and the lack of resources, we had better all
contribute or face the consequences.
Regards,
Werner Engelmaier
Engelmaier Associates, L.C.
Electronic Packaging, Interconnection and Reliability Consulting
7 Jasmine Run
Ormond Beach, FL 32174 USA
Phone: 386-437-8747, Fax: 386-437-8737, Cell: 386-316-5904
E-mail: [log in to unmask], Website: www.engelmaier.com
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